WASP-5b
WASP-5b is an exoplanet orbiting the star WASP-5 located approximately 1000 light-years away in the constellation Phoenix. The planet's mass and radius indicate that it is a gas giant with a similar bulk composition to Jupiter. The small orbital distance of WASP-5 b around its star means it belongs to a class of planets known as hot Jupiters. The planetary equilibrium temperature would be 1717 K, but the measured dayside temperature is higher, with a 2015 study finding 2500±100 K and a 2020 study finding 2000±90 K.
Size comparison of WASP-5b with Jupiter. | |
| Discovery | |
|---|---|
| Discovered by | Anderson et al. (SuperWASP) |
| Discovery site | SAAO |
| Discovery date | October 31, 2007 |
| Transit | |
| Orbital characteristics | |
| 0.02739 ± 0.00039 AU (4,097,000 ± 58,000 km) | |
| Eccentricity | <0.012 |
| 1.62842953(52) d | |
| Inclination | 85.8°±1.1° |
| Semi-amplitude | 268.2+4.6 −4.2 m/s |
| Star | WASP-5 |
| Physical characteristics | |
Mean radius | 1.175±0.056 RJ |
| Mass | 1.590+0.053 −0.052 MJ |
Mean density | 1.21+0.20 −0.16 g/cm3 |
| 28.6 m/s2 2.9 g | |
| Temperature | 2000±90 K (1,730 °C; 3,140 °F) |
A study in 2012, utilizing the Rossiter–McLaughlin effect, determined that the planetary orbit is probably aligned with the equatorial plane of the star, with misalignment equal to 12.1+8
−10°.
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